SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '510381594289c081c7e3e729bdecfc0b90066ffefc23a7824cc159fd63f4d853' 
  AND token = 'MOEkrN+whPAEZqBYGVnQ6ERIhupQGHWvpBz1ZKI3eQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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