SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '748b447bc8c99d4608dd3446330ad32fa0d1f0a4867a11656c188bf6bf8a8b02' 
  AND token = 'eyBdYrIvXDJf7DHr/Q2VKFnk8tq2/FQD9Y1SIVz4Q2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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