SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1387f1bf5a826570ef3e121af73ef69dccf9f077d21b64173b6b5465bc7ee81e' 
  AND token = 'In4N+Y9oVqS6BCrP5zgL/7Q7X5z/9tlsKf7glk5mgU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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