SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b799497a655a06bbc5b9224a3e254d38eb9ae8c1d5ce0b947141a5a591d862e' 
  AND token = '7BQNZjA8PxKK9eFatjjh3vZROOVclTKu5wWXQJvKBpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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