SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e4e4aef97f97d1194f72c25fb6160e74266eade3f5ecb612ae81a3054ab5b39' 
  AND token = 'fuKgF99Ge61LjJwZCjtG4P8nGj0vOZ2+ittBdMNQnC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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