SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '993d263a5b18c96c37bd18863391d551ceddcce32d2b67e3ca081023b1f6fb92' 
  AND token = 'Kyr+3fqRKQkw+4qhO6qKEFS5UdrogoSlgWBWnGZ0UAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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