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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '636c56460b8aa5a01f82dc5a06adf80ce4922e4fe8efc6efebdd17f2127d2043' 
  AND token = 'b2xZ7EfwTyBs/PilsbITzRKrAwnYiqnkwB5VejIcy9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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