SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e871f17b73cf137e87c80d2febb65a63cccfa138fc088ba3f262448dd5642a32' 
  AND token = 'vNqX7BEEqfyLVGog4vAA+oGe2LVd4pJmwXMgLMkw0WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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