SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4fa0fd0df3c4d96d7851ab04950314ac22ba01bdc228cb5eb77228688560ee1' 
  AND token = 'DP5rk7NSZchli8uFX6Nb3oFzBkSnvzSG+4El7JRHKLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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