SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aac225d3d991f34a08bc6d7bf5b8a18b84427e546d56ace539327276b0f2f94' 
  AND token = 's/qJE+ty4PXa+LG6XuhJNXHDyoXmLAOxRczlubN29uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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