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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2669538ecb12af740c671a21e6267252babe1418d3b30b792912e9844cbafd6' 
  AND token = 'd7wQt2drELJ41OvlFK3BBSijV2FxabDKt6v1DwXxTLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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