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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fe1a6c27d966fc633c044323736c4bb31ecc71687e53ad7a8ccba63a9da98eb' 
  AND token = 'gi1Pjhih2j2l9jta5LK8IJxxDUTKzPPh6nO1N6Rr59E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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