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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ad10c47765a0fa2229495609908f8a0876ef785334ccc53ec4197c6b90dff63' 
  AND token = 'WrYwiVTegfp6yETp/YaTnF3HaaMrz9NN2zQs/zRm754=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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