SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3addd87730e1cf32a99bba93fc75e778623740a9f6490235e772fc5be055d219' 
  AND token = 'wgRsY1hikJq3SYKKRhHbJ/nREmH8x8mLRbvHbc0Lzcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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