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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dde8551984ebdc0baa978e8822aced1a40b2740618a967b20f145ffcbdfdadea' 
  AND token = 'sA5ZCwwzMVrG72EuG8G9IZoOlsA4MqgW4i304L4yFrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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