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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cc8762fa6b1b377e9e1a49853ff8d0e6e2c0302a6006e9c066ee89cc249f773' 
  AND token = 'XWXBKq7MNd0lb/0TSK3nZtB5cHr9y5CtuQt3R/nFcpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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