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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f816d2ed8fa6a5f26018277c41fcb8277637b6392c03367e7700f4c431a8d71b' 
  AND token = 'ZszVPWmLH43OBZlEM6CEE9aLBZiMb2YHGy48NyPfwuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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