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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '183cfd6239c0187d53624ab81f8f904c184c51e10f9cc1e3cb30069d5c7b0ecf' 
  AND token = 'MT5qRa9TTaIzUIrnarFedIGZAGakQRtr0R8Td0ZiWu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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