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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d2a741689a03f7300eba2a700c334d634a05ee8dd136bd6eca34760907e2ea' 
  AND token = 'QG/HymCky4MKUWryeTRKVapN4wH3ETO90o9K0wp6BaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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