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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d80f00f67e381248334ebefbbecaa124b35bcc5afd65ed8a6b1ece4fead7230' 
  AND token = 'ugkackOeyaGv4OkeB3XhYNq6+Wf89+cX9qT4yXrLcRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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