Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb397d51ef9e04a1d8c1405cbf054c1d854c4e33b65b0cf25a5cce9e2e9dfb7a' 
  AND token = 'ixLoY1wqIwRub+nafic97GgG4ThJ/kOiF2nOUeaFReY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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