SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b4804970b186ed71fdf357a40f922c06c213313e258ba84cc110318705695be' 
  AND token = 'hDSzYj4xHso9Na5IOI9xUh9L+kp/QrDrdpOL/A4V2VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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