SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e27333639656524ad5bb3d668518356adaa8644960f5a7306d416732a3722393' 
  AND token = 'VxJ3tG62uwWx6fKe+WTQQCZH2yuvRTwVbBODqkKgwd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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