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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b30392f2475e36ea622828023dbf31ff446d9a20baf5d6231b8c572ed839d98' 
  AND token = '4FWxUFIrwFSPCbs6rGy1ujzb6/8WI4CFo24g58TPvrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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