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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96b9cf4136470b80406af5711112f6b216951ab5317c7fd3c0cee69fd3cffa56' 
  AND token = 'tMSFB2wiJ8H3PDxkG5m+keSotaSRMWXpqvBOYeXa+SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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