SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd97d3bdab024a81ef36ae863f6f67c76467751a084b9f1f0b7dad3ffe6febd60' 
  AND token = 'HIl14ZG6nFPc5HZO+jBOGg5LgK/1OiTFWIIeCipGhQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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