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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42a272c25d7bd371553477911a1a6047a742a35bfa5539b965361a84bad4fcba' 
  AND token = '+nSgr34XntFcEDaV3BC9wm3Ur0Wq33yM4waZ1hMyfpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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