SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf30133eeea170f9432cec77520d78a3b5d81f93a7f6c6f02956a4c669666e01' 
  AND token = 'rxlpuiCC+yyFiLKp+vQwsBBDfmHw2WfgwNTjHJqNDtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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