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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ebc6e7222ed71cab55b5f0a4d7ef276dd4c3df0a8953d0050774f928048f76f' 
  AND token = '2c8BPTvIcHgqGjFXNGGxd5VLzf4aJT8HK7oJ2nBcN80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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