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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0647757f23bcf0679d37e9c81e097da811b55f9f441e19673d6302c0fe257dea' 
  AND token = 'OvRHY4xDzfwmr0Nzjtjd3Nu3PzasyR3B4MXvdebMlMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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