SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2a0b8ab7a3785c04fe9b18f98ade1fa76529a68eb4e52f24094c49bd80cf966' 
  AND token = 'cgvPoz7rLFAPr+zPEU/QBiXJT+OmlCjM+Zx0smwT1PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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