SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e070ef34f9ba4bbc9d83f530065fd269c39bba82a942a2f120fad13ecd93e91' 
  AND token = 'yXZeURbpjiJxRzTXBkCX3QlFBdFhx8zRhSjaMpnZKOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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