Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15700e0b3ed960f557e6e559daf6908a207f0029847af89a4bf2391a05b39284' 
  AND token = 'FUwA5/ffH/QwdrZtPL111RXQ8zobSSEQOzN3wfUkciY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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