SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd086a82624237e08898d90a170f1af79b59fa420b28ce9d8330d4658b0542e2a' 
  AND token = 'BJUfZWm5rxSWGVpB5t+zfhDVsO/j7Kzgy6ntCsQsL3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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