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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69f46fda756cd4e5de46e555ec7fb882d09ec8c3b93e831c1ccb1d39956d307d' 
  AND token = 'HBruMc6/WidOFh4dBig1VKvfBj633POf9KRGI0IgUWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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