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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '495f0f8c8601f8abf8fd2f44a529c5c6b1ad8c9e90aef705f2d716dd12421e46' 
  AND token = 'mxrDHmAHxYaZv997XLjDDeeqgRqvXtAAHMyJjS7AVQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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