SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f8eae33b4cfaaca245482b69bc1d58a6a676636642e86ac073fa5913cb4ba31' 
  AND token = 'V+LxkCEyGPNGYlzu7R+PKK4f6qbeEJXG+BgqpJPGSSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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