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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98a2582133c052c01197d05affc1ade66de466506e1c0b87c1d63d6142b2e3a0' 
  AND token = '5c4G9fQMVc1BPZVBujDpSE+VBQucr6xed6VKjV8E5K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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