SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f2b92dd6addc22df105d6cb6cb936d1c3f678367c597a2657d95e05854fb96a' 
  AND token = 'zL2bRb5gwo3APDjvQnl1duBHubI4w6fIVUlgI9nHKJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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