SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '311d163904d8a82cc3f9139469cbb44455c6c4e0e12c2c0f8d63381a6a6f2def' 
  AND token = '5td1bx8/QNQ7fYqXMPPBprVwoMLgI0aqJZOeOpuFlDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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