SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02a8b0f96eca807827d85b517868ad1f5396cff7440311f58d29acf6017a045e' 
  AND token = '/8qjkhqMmdaZ+hGvRqHwAddiUT9XTfzJrPXC5g/vnvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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