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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30fe8dcf69785d431308bc15b7b2b9e988b06a4b982487b8a0b3863dd9db6eee' 
  AND token = 'WMgLPT6WuPNCuzI0IVeF7BG/Hr1AmE3vyDxdWWftq+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}