SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f12cac905bc0e324705d6dabf814e1d26f095386795c09f124d1709c91c43ca1' 
  AND token = 'v4X6FrFr9zYYtbmvKvH5/Dw5KuErTvsQIgTtTtm+2GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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