SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '540c1ee4ca7d6a591fab29a94717d217398b27d390f66c576cb1b43f7fb3980d' 
  AND token = 'To73PPRHoNvOHL4+3mzgz0+iGYZCe6Z5VMu1MCfC9yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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