SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4e663acf45be31e6edbb478a2901f529b9f1bd9ac38fa1cd5539cd00e231ba7' 
  AND token = 'rrGs6UUQsGP16zEfxR/VY8iw/qzfWNX5F27YK10OyY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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