SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd72f796f07786891fd41aaa387b44caa3f0a0a1943b661f37f4b5824e4bad00f' 
  AND token = '+APM/sNKBXUzhRcsDHiLD9+WtP40RpJ8/PXnXNzUpyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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