SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c93540186360f249c0f11cc551c159bf7fbbc69d3742849364c9d650a1378d0' 
  AND token = 'azeEOoLn/RAj+ftcJ/jSrRTYyS03ENe+Bmg41Sz7KZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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