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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9d7cbaa99f28bdc83db157022b3a511d8bc4a57e4258ab10ae7ebd79ac9e636' 
  AND token = '7sQvt6JmXL2zsZz+ayzfNwW6No+7+Al1CVl7z+IthBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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