SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '572f6aa1f005c10b814f01aba95e6dceab6f26bb277904f8c09d573ad60eaf44' 
  AND token = 'Hkuj3wsSDAi3gzKMHYqvnK/sDXXj2wWVaTkQpmkE+CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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