SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f854588a04818f20b860a2ecc359435a745d357d4d40d1a72a90a3de54af75b' 
  AND token = '8Ibx+UaMaVcjQ16zs1JLXGzvtxnA2PyHuCRhq30kMgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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