SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4115429f7e560f79a78fb3160382ed08c4c3b1b2160ffadb4aff5c51f0f4088' 
  AND token = '8dDqNGABoXsXeGolZIJnTDQzRHttlnHUgzRmVcgGhLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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