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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '750a4a405ec6e656e22fde86f4696d521cfc84250f402445c7df55531120564b' 
  AND token = 'kLFwraPC0+bEvJ1QQv03Gh4zaRAVqfviGRvBiMhBBbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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