SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10e6024d81d7ad11df0d308c1654ced096d26d6ae023749b62d0b8e5f6b08b47' 
  AND token = 'L4u0Y9PQDgXZF9kX+twEzkB4oeOaTDfvqyUQcoMqzjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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