SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38878332f3d1c8fca1b395cfee2e01634e3a689187fa21a1b4d5f8b48d06605a' 
  AND token = 'HGLW85jBxz+/HzT3cOKPmmmFPiu3CkgLq2e9blKquxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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