SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06ee489de4b4ffff207420c144d8a256f40bfb5c65dd59ec71b69535f3c8da0a' 
  AND token = 'AYtUKYqh0vPRkFDBc6mgrDpW4VhUe6mQjOhIHiHD4Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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