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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e893bbecae888126b9fa8d2d53d100e55e154c3b154d4913dae9b9089949898' 
  AND token = 'o0oKQbVr1f+eF7aA4xizpncZExv6XuBPhY43N5K83Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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