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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a54adc0100d1326d13421d923263cbbbb078c8c15cea0f20ee5b7ecec37783bf' 
  AND token = 'cUtJrcGWV4EG2M3kLJrpjHI0AD4Q+F+mz/0psVVP/WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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