SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3aa08d5142ddae1f1150d876b0488c91e04b4e804cf753f47492f936dc3081b' 
  AND token = 'qq6g/2i1hmDT3gS1YXSXCVsHhzJhqdYI1vQzMB5Dvi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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