SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dabd9f3fc82f6539f4148bfa58fe74b1d7617cb8afb8737738decdd2f66b522' 
  AND token = 'xn1Vq5KKKuAsjBx+FreRNvXnr6Hv1mW+8f0jhVypltA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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