SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71fc6aae85fb6548765d7e184fc924797f9ef1690364dd766053622e7e0676b4' 
  AND token = 'HevVlhVAyaMgL88U/ObuPFHBQximBZRzbXxa/U5qR+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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