SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0165054973f0175741487a977326d5cab1908b76aaedd75c2f4521a323008e85' 
  AND token = 'MP5ubL5b2kwZPFHnG2DHN+X7WxzYeFH/BvWd8X0mGHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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