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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c19d0217105f1cc085e061b071cb77c5e3f1f9ab559c8286845a1742381bf20f' 
  AND token = 'u7qR2ZhqTH7cccVDK0qdr4+qhc3eL2BcDteXCw1oyZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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