SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073fc362eaac72588c83c3f8a4171ce6545c2bf7c216543b3c82b60084805b3e' 
  AND token = 'mAsJMwAsF8KiZNkEz01SQQ+vhpqnudAr2ATSB5w9lXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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