SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2b13c786c3026c134c5d488e6a42882e46dfb969463a182f474c6d556b44c34' 
  AND token = 'yYUt9TZjFMur+iGSqxJGOFLz1J8wACdmPEVfGmYT7/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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