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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39b8f699cb6308a3ab19d47f5bd8c3541c56c10781b7d41e5ee5348583f9f50b' 
  AND token = 'gxzk6BgmX7cy4QsZlZ1i9vBXSvgeT/UJNo8nDx2aLvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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